Micro-cavity OLED (Organic Light Emitting Diode) display and preparation method thereof

Abstract

The invention provides a micro-cavity OLED display and a preparation method thereof, the micro-cavity OLED display comprises a micro-cavity OLED display assembly and a lens layer covering a light emitting surface of the micro-cavity OLED display assembly, wedge-shaped micro lenses are arranged on the lens layer in an array, and each wedge-shaped micro lens covers at least one pixel unit. The design aims to solve the problem that a strong micro-cavity OLED display is not matched with CRA due to a small visual angle in optical machine application. Compared with a traditional spherical lens, the wedge-shaped lens is adopted, so that remarkable beneficial effects are achieved. Due to the unique design, the brightness of the display changes slightly along with the visual angle, the problem of visual angle limitation is effectively relieved, it means that the display can keep a high brightness level in a wider visual angle range, and therefore the display effect and user experience in optical machine application are improved. In addition, the wedge-shaped lens is also beneficial to reducing stray light, improving the lighting effect and avoiding brightness sacrifice.

Description

Technical Field

[0001] The present application relates to the technical field of display panels, and in particular to a microcavity OLED display and a preparation method thereof. Background Art

[0002] Strong microcavity organic light-emitting diode (OLED) displays have excellent color purity and brightness characteristics due to their unique structural design, enabling microdisplay devices using such displays to achieve high color gamut and high brightness display effects. However, although strong microcavity OLED displays have significant advantages in color and brightness, their inherent small viewing angle limits their wide application in optomechanical applications. In particular, in scenarios where the light emitted by the display needs to be directionally controlled to achieve chief ray angle (CRA) matching, the viewing angle limitation of strong microcavity OLED displays has become a technical problem that needs to be solved urgently.

[0003] Traditionally, spherical microlenses are often used to adjust light in order to achieve CRA matching. However, this method not only introduces stray light problems, but also reduces light efficiency and even requires compromise by reducing the aperture ratio, which in turn affects the maximum brightness of the display. Therefore, an innovative technical solution is urgently needed to overcome the small viewing angle and CRA mismatch problems faced by strong microcavity OLED displays in optical-mechanical applications. Summary of the invention

[0004] The purpose of the present application is to provide a microcavity OLED display and a preparation method thereof, which can improve the above-mentioned problems.

[0005] The embodiment of the present application is implemented as follows:

[0006] In a first aspect, the present application provides a microcavity OLED display, which includes a microcavity OLED display component and a lens layer;

[0007] The microcavity OLED display assembly comprises a pixel unit array, each of the pixel units comprises at least one red light emitting subunit, at least one green light emitting subunit and at least one blue light emitting subunit;

[0008] The lens layer covers the light-emitting surface of the microcavity OLED display component. Wedge-shaped microlenses are arranged in an array on the lens layer, and each of the wedge-shaped microlenses covers at least one of the pixel units.

[0009] It can be understood that the present application proposes a microcavity OLED display, including a microcavity OLED display component and a lens layer covering its light-emitting surface, wherein a wedge-shaped microlens is arrayed on the lens layer, and each wedge-shaped microlens covers at least one pixel unit. This design aims to solve the problems of small viewing angle and CRA mismatch faced by strong microcavity OLED displays in optomechanical applications. Compared with traditional spherical lenses, the use of wedge-shaped lenses brings significant beneficial effects. Its unique design makes the brightness of the display change less with the viewing angle, effectively alleviating the viewing angle limitation problem, which means that the display can maintain a high brightness level within a wider viewing angle range, thereby improving the display effect and user experience in optomechanical applications. In addition, the wedge-shaped lens also helps to reduce stray light, improve light efficiency, and avoid brightness sacrifice.

[0010] In an optional embodiment of the present application, the orthographic projection area of ​​the inclined surface of the wedge-shaped microlens on the microcavity OLED display assembly coincides with at least one of the pixel units.

[0011] In an optional embodiment of the present application, the difference between the coverage area of ​​the wedge-shaped microlens and the area of ​​the orthographic projection region is greater than a preset value.

[0012] It can be understood that the preparation process of microlenses generally includes the steps of exposure, development, baking and flow, wherein during the baking process, as the temperature rises, the lens material layer will gradually soften and enter a molten state, and based on the fluidity of the colloid, its surface tension will drive its shape to change. Therefore, in the preparation process of the wedge-shaped microlens, the wedge-shaped edge portion may be melted and deformed due to the baking step, affecting the final lens morphology. In order to ensure the effect of the bevel of the wedge-shaped microlens on the light output of the OLED, the present application makes the coverage area of ​​the wedge-shaped microlens larger than the orthographic projection area of ​​the bevel, and reserves a certain amount of deformation for the wedge-shaped microlens. In other words, even if the edge of the wedge-shaped microlens is melted and deformed during the baking process, it will not affect the effect of the bevel on the light output.

[0013] In an optional embodiment of the present application, the microcavity OLED display includes any one of the following:

[0014] The inclined surfaces of two adjacent wedge-shaped microlenses in the lens layer are inclined in the same direction. It can be understood that the inclined surfaces of the wedge-shaped microlenses in the lens layer are inclined in the same direction, which can reduce the difficulty of the manufacturing process and improve the manufacturing efficiency.

[0015] The inclined surfaces of two adjacent wedge-shaped microlenses in the lens layer are inclined in different directions; it can be understood that the inclined surfaces of the wedge-shaped microlenses in the lens layer are inclined in different directions, which can make the light output of the display more uniform.

[0016] Furthermore, the inclined surfaces of two adjacent wedge-shaped microlenses in the lens layer are inclined in opposite directions.

[0017] In an optional embodiment of the present application, the microcavity OLED display component includes a display backplane, an interlayer dielectric layer, a reflective layer, a first electrode, an organic light-emitting layer, a second electrode, a protective layer, and a filter layer stacked in sequence; the display backplane includes a substrate and an OLED driving circuit arranged on the substrate, the interlayer dielectric layer covers the OLED driving circuit, and the reflective layer covers the interlayer dielectric layer; an isolation wall for isolating two adjacent light-emitting sub-units is arranged on the reflective layer, and a first electrode is arranged in each light-emitting sub-unit area separated by the isolation wall, the first electrode is connected to the OLED driving circuit through a conductive through hole, each of the first electrodes is provided with the organic light-emitting layer, the second electrode is a common electrode with semi-reflective and semi-transmissive characteristics, covers all the organic light-emitting layers and the isolation wall, and the second electrode is connected to the OLED driving circuit; the protective layer covers the second electrode, the filter layer covers the protective layer, the filter layer includes a light-shielding film layer, and a filter opening is opened in the positive projection area of ​​the light-shielding film layer in each light-emitting sub-unit area, and each of the filter openings is filled with a corresponding monochrome filter film.

[0018] It can be understood that when a voltage is applied, the OLED driving circuit controls the flow of current between the first electrode and the second electrode, so that electrons are injected from the cathode into the organic light-emitting layer and recombine with holes injected from the anode. The energy released during the recombination process is emitted in the form of photons to form visible light. In the microcavity OLED display assembly, the light emitted by the organic light-emitting layer is mainly reflected between the reflective layer and the transparent or translucent electrode layer (such as the anode or cathode), forming a microcavity effect. When the wavelength of light matches the resonant wavelength of the microcavity, the light constructively interferes in the microcavity, which significantly enhances the intensity of the light. At the same time, the microcavity effect also helps to narrow the emission spectrum and improve the color purity.

[0019] In addition, although this application mainly focuses on the CRA matching problem of microcavity OLED displays, the microcavity effect itself also has a certain influence on the viewing angle characteristics. By optimizing the design of the microcavity structure, the viewing angle characteristics of the display can be improved to a certain extent, so that good display effects can be obtained at different viewing angles.

[0020] In an optional embodiment of the present application, the microcavity OLED display includes at least one of the following:

[0021] The reflective layer is a reflective layer with conductive properties, for example, it can be a reflective layer with conductive properties such as aluminum (Al), platinum (Pt), gold (Au), silver (Ag), chromium (Cr), tungsten (W), etc.

[0022] The reflective layer and the first electrode are made of the same material and are integrally formed, that is, the reflective layer and the first electrode can be integral.

[0023] The reflective layer is a reflective film layer with insulating properties; optionally, when the reflective layer is a reflective film layer with insulating properties, a transparent conductive layer is further provided between the reflective layer and the first electrode.

[0024] In an optional embodiment of the present application, the monochrome filter film includes a red light filter film, a blue light filter film and a green light filter film, the light-emitting sub-unit region corresponding to the red light filter film is a red light-emitting sub-unit region, the light-emitting sub-unit region corresponding to the blue light filter film is a blue light-emitting sub-unit region, and the light-emitting sub-unit region corresponding to the green light filter film is a green light-emitting sub-unit region; the thickness of the first transparent conductive layer in the red light-emitting sub-unit region is a first thickness, the thickness of the second transparent conductive layer in the green light-emitting sub-unit region is a second thickness, and the thickness of the third transparent conductive layer in the blue light-emitting sub-unit region is a third thickness, the first thickness is greater than the second thickness, and the second thickness is greater than the third thickness.

[0025] It can be understood that when a strong microcavity effect occurs, the length of the microcavity is proportional to the wavelength of the emitted light, so the length of the microcavity increases as the wavelength of the emitted light of the corresponding light-emitting subunit increases. In a microcavity OLED display component, in order to achieve full-color display, light-emitting subunits that emit red, green and blue light are usually included. Since light of different colors has different wavelengths, in order to achieve a strong microcavity effect, the lengths of the microcavities corresponding to light of different colors also need to be different. Specifically, since the wavelength of red light is longer, the corresponding microcavity length is also larger, followed by the wavelength of green light, and the corresponding microcavity length is moderate, while the wavelength of blue light is shorter, and the corresponding microcavity length is relatively small. Since the thickness of the other layers of the microcavity in the microcavity OLED display component is the same, the microcavity lengths of light-emitting subunits of different wavelengths can be reflected by changing the thickness of the transparent conductive layer.

[0026] In an optional embodiment of the present application, the first electrodes in the red light emitting sub-unit region, the green light emitting sub-unit region and the blue light emitting sub-unit region are all located in the same horizontal plane; the thickness of the first interlayer dielectric layer in the red light emitting sub-unit region is the fourth thickness, the thickness of the second interlayer dielectric layer in the green light emitting sub-unit region is the fifth thickness, and the thickness of the third interlayer dielectric layer in the blue light emitting sub-unit region is the sixth thickness; the fourth thickness is smaller than the fifth thickness, and the fifth thickness is smaller than the sixth thickness.

[0027] In the second aspect, the present application discloses a method for preparing a microcavity OLED display, including steps S1 to S3, wherein S1, S2, etc. are merely step identifiers, and the execution order of the method is not necessarily in ascending order of numbers, for example, step S2 may be executed first and then step S1, and the present application does not impose any limitation thereto.

[0028] S1, providing a microcavity OLED display component, wherein the microcavity OLED display component comprises a pixel unit array, each of the pixel units comprises at least one red light emitting subunit, at least one green light emitting subunit and at least one blue light emitting subunit;

[0029] S2, preparing a lens layer, wherein wedge-shaped microlenses are arranged in an array on the lens layer;

[0030] S3, covering the lens layer on the light-emitting surface of the microcavity OLED display assembly so that each of the wedge-shaped microlenses covers at least one of the pixel units.

[0031] In an optional embodiment of the present application, step S2 includes the following steps:

[0032] S21, providing an original lens material layer and performing a first exposure process to form a preliminary wedge-shaped microlens pattern;

[0033] S22, developing the exposed lens material layer to remove the unexposed portion to form a preliminary wedge-shaped microlens structure;

[0034] S23, performing a second exposure process on the preliminary wedge-shaped microlens structure to further solidify and adjust the wedge shape;

[0035] S24, baking the lens material layer after the second exposure process to enhance the stability and durability of the lens layer material;

[0036] S25, performing a leveling treatment on the baked lens material layer to make the surface of the lens layer flat, thereby obtaining the lens layer.

[0037] Beneficial effects:

[0038] The present application proposes a microcavity OLED display and a preparation method thereof, wherein the microcavity OLED display includes a microcavity OLED display component and a lens layer covering the light-emitting surface thereof, wherein a wedge-shaped microlens is arrayed on the lens layer, and each wedge-shaped microlens covers at least one pixel unit. This design aims to solve the problems of small viewing angle and CRA mismatch faced by strong microcavity OLED displays in optical-mechanical applications. Compared with traditional spherical lenses, the use of wedge-shaped lenses brings significant beneficial effects. Its unique design makes the brightness of the display change less with the viewing angle, effectively alleviating the problem of viewing angle limitation, which means that the display can maintain a high brightness level within a wider viewing angle range, thereby improving the display effect and user experience in optical-mechanical applications. In addition, the wedge-shaped lens also helps to reduce stray light, improve light efficiency, and avoid brightness sacrifice.

[0039] In order to make the above-mentioned objects, features and advantages of the present application more obvious and understandable, optional embodiments are specifically listed below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0041] Figure 1 is a schematic structural diagram of a microcavity OLED display provided by the present application;

[0042] Figure 2 is a schematic structural diagram of another microcavity OLED display provided by the present application;

[0043] Figure 3 is an enlarged schematic diagram of a lens layer 20 provided in the present application;

[0044] Figure 4 yes Figure 1 A schematic diagram of the specific structure of the microcavity OLED display shown;

[0045] Figure 5 This is a schematic structural diagram of another microcavity OLED display provided in the present application. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0047] First, as Figure 1 and Figure 2 As shown, the present application provides a microcavity OLED display, which includes a microcavity OLED display component 10 and a lens layer 20 .

[0048] The microcavity OLED display assembly 10 includes a pixel unit array, each pixel unit including at least one red light emitting subunit, at least one green light emitting subunit and at least one blue light emitting subunit. Figure 1 and Figure 2 As shown, each pixel unit 100 includes a red light emitting subunit 101 , a green light emitting subunit 102 , and a blue light emitting subunit 103 .

[0049] The lens layer 20 covers the light-emitting surface of the microcavity OLED display assembly 10. The lens layer 20 is arrayed with wedge-shaped microlenses 200, and each wedge-shaped microlens 200 covers at least one pixel unit. Figure 1 As shown, each wedge-shaped microlens 200 has a single pixel unit 100; Figure 2 As shown, each wedge-shaped microlens 200 has two pixel units 100 .

[0050] It can be understood that the present application proposes a microcavity OLED display, including a microcavity OLED display component 10 and a lens layer 20 covering its light-emitting surface, wherein a wedge-shaped microlens 200 is arranged in an array on the lens layer 20, and each wedge-shaped microlens 200 covers at least one pixel unit. This design is intended to solve the problem of small viewing angle and CRA mismatch faced by strong microcavity OLED displays in optical-mechanical applications. Compared with traditional spherical lenses, the use of wedge-shaped lenses brings significant beneficial effects. Its unique design makes the brightness of the display change less with the viewing angle, effectively alleviating the problem of viewing angle limitation, which means that the display can maintain a high brightness level within a wider viewing angle range, thereby improving the display effect and user experience in optical-mechanical applications. In addition, the wedge-shaped lens also helps to reduce stray light, improve light efficiency, and avoid brightness sacrifice. Experiments show that compared with traditional spherical microlenses, the brightness of the wedge-shaped microlenses changes less with the viewing angle, especially in the case of a large viewing angle greater than 15°, the brightness of the OLED display with a wedge-shaped microlens is significantly better than that of the OLED display with a traditional spherical microlens.

[0051] In an optional embodiment of the present application, if Figure 1 As shown, the orthographic projection area of ​​the slope of the wedge-shaped microlens 200 on the microcavity OLED display assembly 10 coincides with at least one pixel unit 100 .

[0052] In an optional embodiment of the present application, if Figure 1 As shown, the difference between the coverage area S1 of the wedge-shaped microlens 200 and the area S2 of the orthographic projection region is greater than a preset value.

[0053] It can be understood that the preparation process of microlenses generally includes the steps of exposure, development, baking and flow. During the baking process, as the temperature rises, the lens material layer will gradually soften and enter a molten state. Based on the fluidity of the colloid, its surface tension will drive its shape to change, such as Figure 3 As shown. Therefore, during the preparation of the wedge-shaped microlens, the edge of the wedge may be melted and deformed due to the baking step, affecting the final lens shape. In order to ensure the effect of the inclined surface of the wedge-shaped microlens on the light emission of the OLED, the present application makes the coverage area of ​​the wedge-shaped microlens larger than the orthographic projection area of ​​the inclined surface, and reserves a certain amount of deformation for the wedge-shaped microlens. In other words, even if the edge of the wedge-shaped microlens is melted and deformed during the baking process, it will not affect the effect of its inclined surface on the light emission.

[0054] In an optional embodiment of the present application, the microcavity OLED display includes any one of the following:

[0055] The inclined surfaces of two adjacent wedge-shaped microlenses 200 in the lens layer 20 are inclined in the same direction. It can be understood that the inclined surfaces of the wedge-shaped microlenses 200 in the lens layer 20 are inclined in the same direction, which can reduce the difficulty of the manufacturing process and improve the manufacturing efficiency.

[0056] The inclined surfaces of two adjacent wedge-shaped microlenses 200 in the lens layer 20 are inclined in different directions; it can be understood that the inclined surfaces of the wedge-shaped microlenses 200 in the lens layer 20 are inclined in different directions, which can make the light output of the display more uniform.

[0057] Furthermore, the inclined surfaces of two adjacent wedge-shaped microlenses 200 in the lens layer 20 are inclined in opposite directions.

[0058] In an optional embodiment of the present application, if Figure 4 As shown, the microcavity OLED display assembly 10 includes a display backplane 11, an interlayer dielectric layer 12, a reflective layer 13, a first electrode 14, an organic light-emitting layer 15, a second electrode 16, a protective layer 17, and a filter layer 18 which are stacked in sequence.

[0059] The display backplane 11 includes a substrate and an OLED driving circuit disposed on the substrate. The substrate may include a transparent glass material, such as silicon dioxide (SiO2). The substrate may also include a transparent plastic material, such as polyethersulfone (PES), polyacrylate (PAR), polyetherimide (PEI), polyethylene terephthalate (PEN), polyethylene terephthalate (PET), polyphenylene sulfide (PPS), polyarylate, polyimide, polycarbonate (PC), triacetyl cellulose (TAC) or cellulose propionate (CAP) and other organic materials. The OLED driving circuit includes a driving circuit for driving the OLED, such as a thin film transistor TFT, a gate line for sending an on / off signal to the thin film transistor TFT, and a signal line.

[0060] The interlayer dielectric layer 12 covers the OLED driving circuit to play an insulating and protective role to prevent the circuit from short circuiting or damage. The interlayer dielectric layer 12 may include an organic material, such as polymethyl methacrylate (PMMA) or polystyrene (PS), a polymer derivative having a phenolic group, an propylene polymer, an imide polymer, an aromatic ether polymer, an amide polymer, a fluorine polymer, a p-xylene polymer, a vinyl alcohol polymer, or any combination thereof.

[0061] The reflective layer 13 is covered on the interlayer dielectric layer 12; an isolation wall 130 for isolating two adjacent light-emitting sub-units is arranged on the reflective layer 13, and a first electrode 14 is arranged in each light-emitting sub-unit area separated by the isolation wall 130, and the first electrode 14 is connected to the OLED driving circuit through a conductive through hole, and an organic light-emitting layer 15 is arranged on each first electrode 14, and the second electrode 16 is a common electrode with semi-reflective and semi-transmissive characteristics, covering all organic light-emitting layers 15 and the isolation wall 130, and the second electrode 16 is connected to the OLED driving circuit.

[0062] In the embodiment of the present application, the first electrode 14 can also serve as the reflective layer 13 to improve the luminous efficiency of the OLED element, and its material includes platinum (Pt), gold (Au), silver (Ag), chromium (Cr) or tungsten (W); the first electrode 14 can also be transparent indium tin oxide. The second electrode 16 can be a laminated structure of metal and transparent conductive material, such as a laminate of silver (Ag) and indium tin oxide (ITO) or indium zinc oxide (IZO). Such a laminated structure not only ensures the conductivity of the electrode, but also achieves a semi-transparent and semi-reflective effect.

[0063] The protection layer 17 covers the second electrode 16 , and the filter layer 18 covers the protection layer 17 . The protection layer 17 may be a thick film photoresist or a dielectric layer.

[0064] The filter layer 18 includes a light shielding film layer 180, and a filter opening is opened in the orthographic projection area of ​​each light-emitting sub-unit area, and each filter opening is filled with a corresponding monochromatic filter film. Figure 4 As shown, each light-emitting subunit region is provided with a red light filter film 191, a green light filter film 192, and a blue light filter film 193. Among them, the light-shielding film layer 180 can be made of a chromium (Cr) film, which has good light-shielding performance and chemical stability, and is suitable as a black matrix layer material to isolate and prevent color mixing between color filter elements, and improve the contrast and color purity of the display panel.

[0065] It can be understood that when a voltage is applied, the OLED driving circuit controls the flow of current between the first electrode 14 and the second electrode 16, so that electrons are injected from the cathode into the organic light-emitting layer 15 and recombine with holes injected from the anode. The energy released during the recombination process is emitted in the form of photons to form visible light. In the microcavity OLED display component 10, the light emitted by the organic light-emitting layer 15 is mainly reflected between the reflective layer 13 and the transparent or translucent electrode layer to form a microcavity effect. When the wavelength of light matches the resonant wavelength of the microcavity, the light constructively interferes in the microcavity, so that the intensity of the light is significantly enhanced. At the same time, the microcavity effect also helps to narrow the emission spectrum and improve the color purity.

[0066] In addition, although this application mainly focuses on the CRA matching problem of microcavity OLED displays, the microcavity effect itself also has a certain influence on the viewing angle characteristics. By optimizing the design of the microcavity structure, the viewing angle characteristics of the display can be improved to a certain extent, so that good display effects can be obtained at different viewing angles.

[0067] In an optional embodiment of the present application, the microcavity OLED display includes at least one of the following:

[0068] The reflective layer 13 is a reflective layer 13 with conductive properties, for example, it can be a reflective layer 13 with conductive properties such as aluminum (Al), platinum (Pt), gold (Au), silver (Ag), chromium (Cr), tungsten (W), etc.;

[0069] The reflective layer 13 and the first electrode 14 are made of the same material and are integrally formed, that is, the reflective layer 13 and the first electrode 14 can be integral;

[0070] The reflective layer 13 is a reflective film layer with insulating properties; optionally, when the reflective layer 13 is a reflective film layer with insulating properties, a transparent conductive layer is further provided between the reflective layer 13 and the first electrode 14, such as Figure 5 The transparent conductive layer 30 is shown.

[0071] In an optional embodiment of the present application, if Figure 5As shown, the monochromatic filter film includes a red filter film 191, a blue filter film 193 and a green filter film 192. The light-emitting subunit region corresponding to the red filter film 191 is the red light-emitting subunit region, the light-emitting subunit region corresponding to the blue filter film 193 is the blue light-emitting subunit region, and the light-emitting subunit region corresponding to the green filter film 192 is the green light-emitting subunit region. Figure 5 As shown, the thickness of the first transparent conductive layer 31 in the red light emitting subunit region is the first thickness, that is, the distance between the first electrode 14 and the reflective layer 13 in the red light emitting subunit region is the first thickness, the thickness of the second transparent conductive layer 32 in the green light emitting subunit region is the second thickness, and the thickness of the third transparent conductive layer 33 in the blue light emitting subunit region is the third thickness, the first thickness is greater than the second thickness, and the second thickness is greater than the third thickness.

[0072] It can be understood that when a strong microcavity effect occurs, the microcavity length is proportional to the wavelength of the emitted light, so the microcavity length increases as the wavelength of the emitted light of the corresponding light-emitting subunit increases. In the microcavity OLED display component 10, in order to achieve full-color display, light-emitting subunits that emit red light, green light and blue light are usually included. Since light of different colors has different wavelengths, in order to achieve a strong microcavity effect, the microcavity lengths corresponding to light of different colors also need to be different. Specifically, since the wavelength of red light is longer, the corresponding microcavity length is also larger, the wavelength of green light is second, and the corresponding microcavity length is moderate, while the wavelength of blue light is shorter, and the corresponding microcavity length is relatively small. Since the thickness of the other layers of the microcavity in the microcavity OLED display component 10 is the same, the microcavity lengths of light-emitting subunits of different wavelengths can be reflected by changing the thickness of the transparent conductive layer.

[0073] In an optional embodiment of the present application, the first electrodes 14 in the red light emitting sub-unit region, the green light emitting sub-unit region and the blue light emitting sub-unit region are all located in the same horizontal plane; the thickness of the first interlayer dielectric layer in the red light emitting sub-unit region is the fourth thickness, the thickness of the second interlayer dielectric layer in the green light emitting sub-unit region is the fifth thickness, and the thickness of the third interlayer dielectric layer in the blue light emitting sub-unit region is the sixth thickness; the fourth thickness is less than the fifth thickness, and the fifth thickness is less than the sixth thickness.

[0074] In the second aspect, the present application discloses a method for preparing a microcavity OLED display, including steps S1 to S3, wherein S1, S2, etc. are merely step identifiers, and the execution order of the method is not necessarily in ascending order of numbers, for example, step S2 may be executed first and then step S1, and the present application does not impose any limitation thereto.

[0075] S1, providing a microcavity OLED display component, wherein the microcavity OLED display component comprises a pixel unit array, each of the pixel units comprises at least one red light emitting subunit, at least one green light emitting subunit and at least one blue light emitting subunit;

[0076] S2, preparing a lens layer, wherein wedge-shaped microlenses are arranged in an array on the lens layer;

[0077] S3, covering the lens layer on the light-emitting surface of the microcavity OLED display assembly so that each of the wedge-shaped microlenses covers at least one of the pixel units.

[0078] In an optional embodiment of the present application, step S2 includes the following steps:

[0079] S21, providing an original lens material layer and performing a first exposure process to form a preliminary wedge-shaped microlens pattern;

[0080] S22, developing the exposed lens material layer to remove the unexposed portion to form a preliminary wedge-shaped microlens structure;

[0081] S23, performing a second exposure process on the preliminary wedge-shaped microlens structure to further solidify and adjust the wedge shape;

[0082] S24, baking the lens material layer after the second exposure process to enhance the stability and durability of the lens layer material;

[0083] S25, performing a leveling treatment on the baked lens material layer to make the surface of the lens layer flat, thereby obtaining the lens layer.

[0084] The expressions "first", "second", "the first" or "the second" used in various embodiments of the present disclosure may modify various components regardless of order and / or importance, but these expressions do not limit the corresponding components. The above expressions are only configured for the purpose of distinguishing an element from other elements. For example, a first user device and a second user device represent different user devices, although both are user devices. For example, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element without departing from the scope of the present disclosure.

[0085] When one element (e.g., a first element) is referred to as being "(operably or communicatively) coupled" or "(operably or communicatively) coupled to" or "connected to" another element (e.g., a second element), it is understood that the one element is directly connected to the other element or the one element is indirectly connected to the other element via yet another element (e.g., a third element). Conversely, it is understood that when an element (e.g., a first element) is referred to as being "directly connected" or "directly coupled" to another element (the second element), no element (e.g., a third element) is interposed between the two.

[0086] It should be noted that, in this article, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "includes a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element. In addition, components, features, and elements with the same name in different embodiments of the present application may have the same meaning or different meanings, and their specific meanings need to be determined by their explanation in the specific embodiment or further combined with the context of the specific embodiment.

[0087] The above description is only an optional embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above invention concept. For example, the above features are replaced with the technical features with similar functions disclosed in this application (but not limited to) by each other.

[0088] As used herein, the words "if" and "if" may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0089] The above description is only an optional embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above invention concept. For example, the above features are replaced with the technical features with similar functions disclosed in this application (but not limited to) by each other.

[0090] The above description is only an optional embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A microcavity OLED display, characterized in that: including a microcavity OLED display component and a lens layer; The microcavity OLED display assembly comprises a pixel unit array, each of the pixel units comprises at least one red light emitting subunit, at least one green light emitting subunit and at least one blue light emitting subunit; The lens layer covers the light-emitting surface of the microcavity OLED display component. Wedge-shaped microlenses are arranged in an array on the lens layer, and each of the wedge-shaped microlenses covers at least one of the pixel units.

2. The microcavity OLED display according to claim 1, characterized in that: The orthographic projection area of ​​the inclined surface of the wedge-shaped microlens on the microcavity OLED display assembly coincides with at least one of the pixel units.

3. The microcavity OLED display according to claim 3, characterized in that: The difference between the coverage area of ​​the wedge-shaped microlens and the area of ​​the orthographic projection region is greater than a preset value.

4. The microcavity OLED display according to any one of claims 1 to 3, characterized in that: Include any of the following: The inclined surfaces of two adjacent wedge-shaped microlenses in the lens layer are inclined in the same direction; The inclined surfaces of two adjacent wedge-shaped microlenses in the lens layer are inclined in different directions; The inclined surfaces of two adjacent wedge-shaped microlenses in the lens layer are inclined in opposite directions.

5. The microcavity OLED display according to claim 4, characterized in that: The microcavity OLED display assembly includes a display backplane, an interlayer dielectric layer, a reflective layer, a first electrode, an organic light-emitting layer, a second electrode, a protective layer, and a filter layer stacked in sequence; The display backplane includes a substrate and an OLED driving circuit disposed on the substrate, the interlayer dielectric layer covers the OLED driving circuit, and the reflective layer covers the interlayer dielectric layer; The reflective layer is provided with an isolation wall for isolating two adjacent light-emitting sub-units, and a first electrode is provided in each light-emitting sub-unit region separated by the isolation wall, and the first electrode is connected to the OLED driving circuit through a conductive through hole, and each of the first electrodes is provided with the organic light-emitting layer, and the second electrode is a common electrode with semi-reflective and semi-transmissive characteristics, covering all the organic light-emitting layers and the isolation wall, and the second electrode is connected to the OLED driving circuit; The protective layer covers the second electrode, the filter layer covers the protective layer, the filter layer includes a shading film layer, and a filter opening is opened in the orthographic projection area of ​​each light-emitting sub-unit area, and each filter opening is filled with a corresponding monochromatic filter film.

6. The microcavity OLED display according to claim 5, characterized in that: Include at least one of the following: The reflective layer is a reflective layer with conductive properties; The reflective layer and the first electrode are made of the same material and are integrally formed; The reflective layer is a reflective film layer with insulating properties.

7. The microcavity OLED display according to claim 6, characterized in that: When the reflective layer is a reflective film layer with insulating properties, a transparent conductive layer is further provided between the reflective layer and the first electrode.

8. The microcavity OLED display according to claim 7, characterized in that: The monochromatic filter film includes a red light filter film, a blue light filter film and a green light filter film, the light-emitting sub-unit region corresponding to the red light filter film is a red light-emitting sub-unit region, the light-emitting sub-unit region corresponding to the blue light filter film is a blue light-emitting sub-unit region, and the light-emitting sub-unit region corresponding to the green light filter film is a green light-emitting sub-unit region; The thickness of the first transparent conductive layer in the red light emitting subunit region is a first thickness, the thickness of the second transparent conductive layer in the green light emitting subunit region is a second thickness, and the thickness of the third transparent conductive layer in the blue light emitting subunit region is a third thickness. The first thickness is greater than the second thickness, and the second thickness is greater than the third thickness.

9. A method for preparing a microcavity OLED display, characterized in that: The following steps are involved: S1, providing a microcavity OLED display component, wherein the microcavity OLED display component comprises a pixel unit array, each of the pixel units comprises at least one red light emitting subunit, at least one green light emitting subunit and at least one blue light emitting subunit; S2, preparing a lens layer, wherein wedge-shaped microlenses are arranged in an array on the lens layer; S3, covering the lens layer on the light-emitting surface of the microcavity OLED display assembly so that each of the wedge-shaped microlenses covers at least one of the pixel units.

10. The method for preparing a microcavity OLED display according to claim 9, characterized in that: The step S2 comprises the following steps: S21, providing an original lens material layer and performing a first exposure process to form a preliminary wedge-shaped microlens pattern; S22, developing the exposed lens material layer to remove the unexposed portion to form a preliminary wedge-shaped microlens structure; S23, performing a second exposure process on the preliminary wedge-shaped microlens structure to further solidify and adjust the wedge shape; S24, baking the lens material layer after the second exposure process to enhance the stability and durability of the lens layer material; S25, performing a leveling treatment on the baked lens material layer to make the surface of the lens layer flat, thereby obtaining the lens layer.

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